GENEVA (Reuters) - The United Nations human rights investigator
on North Korea called on Pyongyang on Friday to provide a full
explanation of why an American student was returned home this
week in a coma after being in custody for more than year.

Otto Warmbier, a 22-year-old university student released to the
United States this week after being held in North Korea for 17
months, has a severe brain injury and is in a state of
"unresponsive wakefulness", his Ohio doctors said on Thursday.

"While I welcome the news of Mr Warmbier's release, I am very
concerned about his condition, and the authorities have to
provide a clear explanation about what made him slip into a
coma," Tomas Ojea Quintana, the U.N. special rapporteur on human
rights in the Democratic People's Republic of Korea (DPRK), said
in a statement issued in Geneva.